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Finding the Fourth Proportional to 978.67, 1,351.52 and 924.13

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Solution

The fourth proportional to 978.67, 1,351.52 and 924.13 is: 1,276.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.67 : 1,351.52 = 924.13 : x
  2. Step 2: Convert to fraction form
    978.67/1,351.52 = 924.13/x
  3. Step 3: Cross multiply
    978.67x = 1,351.52 × 924.13
  4. Step 4: Simplify right side
    978.67x = 1,248,980.18
  5. Step 5: Solve for x
    x = 1,248,980.18/978.67
  6. Step 6: Final answer
    x = 1,276.20

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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.