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Finding the Fourth Proportional to 810.68, 1,119.10 and 624.10

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Solution

The fourth proportional to 810.68, 1,119.10 and 624.10 is: 861.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.68 : 1,119.10 = 624.10 : x
  2. Step 2: Convert to fraction form
    810.68/1,119.10 = 624.10/x
  3. Step 3: Cross multiply
    810.68x = 1,119.10 × 624.10
  4. Step 4: Simplify right side
    810.68x = 698,430.31
  5. Step 5: Solve for x
    x = 698,430.31/810.68
  6. Step 6: Final answer
    x = 861.54

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Double scale
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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.