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Finding the Fourth Proportional to 102,654.30, 153,981.45 and 85,374.30

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Solution

The fourth proportional to 102,654.30, 153,981.45 and 85,374.30 is: 128,061.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,654.30 : 153,981.45 = 85,374.30 : x
  2. Step 2: Convert to fraction form
    102,654.30/153,981.45 = 85,374.30/x
  3. Step 3: Cross multiply
    102,654.30x = 153,981.45 × 85,374.30
  4. Step 4: Simplify right side
    102,654.30x = 13,146,058,506.74
  5. Step 5: Solve for x
    x = 13,146,058,506.74/102,654.30
  6. Step 6: Final answer
    x = 128,061.45

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1.5x scale

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.