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Finding the Fourth Proportional to 459.47, 690.12 and 430.31

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Solution

The fourth proportional to 459.47, 690.12 and 430.31 is: 646.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.47 : 690.12 = 430.31 : x
  2. Step 2: Convert to fraction form
    459.47/690.12 = 430.31/x
  3. Step 3: Cross multiply
    459.47x = 690.12 × 430.31
  4. Step 4: Simplify right side
    459.47x = 296,967.26
  5. Step 5: Solve for x
    x = 296,967.26/459.47
  6. Step 6: Final answer
    x = 646.32

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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.