Home / 1,210.20-1,669.90-712.76

Finding the Fourth Proportional to 1,210.20, 1,669.90 and 712.76

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Solution

The fourth proportional to 1,210.20, 1,669.90 and 712.76 is: 983.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.20 : 1,669.90 = 712.76 : x
  2. Step 2: Convert to fraction form
    1,210.20/1,669.90 = 712.76/x
  3. Step 3: Cross multiply
    1,210.20x = 1,669.90 × 712.76
  4. Step 4: Simplify right side
    1,210.20x = 1,190,237.92
  5. Step 5: Solve for x
    x = 1,190,237.92/1,210.20
  6. Step 6: Final answer
    x = 983.51

Related Problems

Find fourth proportional to 605.10, 834.95 and 356.38
Half scale
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Double scale
Find fourth proportional to 1,211.20, 1,671.28 and 713.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.