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Finding the Fourth Proportional to 954.88, 1,430.72 and 521.28

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Solution

The fourth proportional to 954.88, 1,430.72 and 521.28 is: 781.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.88 : 1,430.72 = 521.28 : x
  2. Step 2: Convert to fraction form
    954.88/1,430.72 = 521.28/x
  3. Step 3: Cross multiply
    954.88x = 1,430.72 × 521.28
  4. Step 4: Simplify right side
    954.88x = 745,805.72
  5. Step 5: Solve for x
    x = 745,805.72/954.88
  6. Step 6: Final answer
    x = 781.05

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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.