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Finding the Fourth Proportional to 864.32, 1,296.88 and 431.51

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Solution

The fourth proportional to 864.32, 1,296.88 and 431.51 is: 647.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.32 : 1,296.88 = 431.51 : x
  2. Step 2: Convert to fraction form
    864.32/1,296.88 = 431.51/x
  3. Step 3: Cross multiply
    864.32x = 1,296.88 × 431.51
  4. Step 4: Simplify right side
    864.32x = 559,609.13
  5. Step 5: Solve for x
    x = 559,609.13/864.32
  6. Step 6: Final answer
    x = 647.46

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1.5x scale

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.