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Finding the Fourth Proportional to 875.16, 1,311.12 and 631.08

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Solution

The fourth proportional to 875.16, 1,311.12 and 631.08 is: 945.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.16 : 1,311.12 = 631.08 : x
  2. Step 2: Convert to fraction form
    875.16/1,311.12 = 631.08/x
  3. Step 3: Cross multiply
    875.16x = 1,311.12 × 631.08
  4. Step 4: Simplify right side
    875.16x = 827,421.61
  5. Step 5: Solve for x
    x = 827,421.61/875.16
  6. Step 6: Final answer
    x = 945.45

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.