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Finding the Fourth Proportional to 875.41, 1,207.89 and 665.53

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Solution

The fourth proportional to 875.41, 1,207.89 and 665.53 is: 918.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.41 : 1,207.89 = 665.53 : x
  2. Step 2: Convert to fraction form
    875.41/1,207.89 = 665.53/x
  3. Step 3: Cross multiply
    875.41x = 1,207.89 × 665.53
  4. Step 4: Simplify right side
    875.41x = 803,887.03
  5. Step 5: Solve for x
    x = 803,887.03/875.41
  6. Step 6: Final answer
    x = 918.30

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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.