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Finding the Fourth Proportional to 945.12, 1,417.60 and 424.88

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Solution

The fourth proportional to 945.12, 1,417.60 and 424.88 is: 637.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.12 : 1,417.60 = 424.88 : x
  2. Step 2: Convert to fraction form
    945.12/1,417.60 = 424.88/x
  3. Step 3: Cross multiply
    945.12x = 1,417.60 × 424.88
  4. Step 4: Simplify right side
    945.12x = 602,309.89
  5. Step 5: Solve for x
    x = 602,309.89/945.12
  6. Step 6: Final answer
    x = 637.28

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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.