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Finding the Fourth Proportional to 810.68, 1,120 and 624.92

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Solution

The fourth proportional to 810.68, 1,120 and 624.92 is: 863.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.68 : 1,120 = 624.92 : x
  2. Step 2: Convert to fraction form
    810.68/1,120 = 624.92/x
  3. Step 3: Cross multiply
    810.68x = 1,120 × 624.92
  4. Step 4: Simplify right side
    810.68x = 699,910.40
  5. Step 5: Solve for x
    x = 699,910.40/810.68
  6. Step 6: Final answer
    x = 863.36

Related Problems

Find fourth proportional to 405.34, 560 and 312.46
Half scale
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Double scale
Find fourth proportional to 811.68, 1,121.38 and 625.92
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.