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Finding the Fourth Proportional to 487.40, 672.12 and 434.07

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Solution

The fourth proportional to 487.40, 672.12 and 434.07 is: 598.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.40 : 672.12 = 434.07 : x
  2. Step 2: Convert to fraction form
    487.40/672.12 = 434.07/x
  3. Step 3: Cross multiply
    487.40x = 672.12 × 434.07
  4. Step 4: Simplify right side
    487.40x = 291,747.13
  5. Step 5: Solve for x
    x = 291,747.13/487.40
  6. Step 6: Final answer
    x = 598.58

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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.