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Finding the Fourth Proportional to 810.45, 1,220.87 and 701.10

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Solution

The fourth proportional to 810.45, 1,220.87 and 701.10 is: 1,056.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.45 : 1,220.87 = 701.10 : x
  2. Step 2: Convert to fraction form
    810.45/1,220.87 = 701.10/x
  3. Step 3: Cross multiply
    810.45x = 1,220.87 × 701.10
  4. Step 4: Simplify right side
    810.45x = 855,953.71
  5. Step 5: Solve for x
    x = 855,953.71/810.45
  6. Step 6: Final answer
    x = 1,056.15

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.