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Finding the Fourth Proportional to 875.40, 1,207.02 and 665.04

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Solution

The fourth proportional to 875.40, 1,207.02 and 665.04 is: 916.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.40 : 1,207.02 = 665.04 : x
  2. Step 2: Convert to fraction form
    875.40/1,207.02 = 665.04/x
  3. Step 3: Cross multiply
    875.40x = 1,207.02 × 665.04
  4. Step 4: Simplify right side
    875.40x = 802,716.58
  5. Step 5: Solve for x
    x = 802,716.58/875.40
  6. Step 6: Final answer
    x = 916.97

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Double scale
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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.