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Finding the Fourth Proportional to 268,478.70, 402,690.31 and 90,981.10

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Solution

The fourth proportional to 268,478.70, 402,690.31 and 90,981.10 is: 136,462.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,478.70 : 402,690.31 = 90,981.10 : x
  2. Step 2: Convert to fraction form
    268,478.70/402,690.31 = 90,981.10/x
  3. Step 3: Cross multiply
    268,478.70x = 402,690.31 × 90,981.10
  4. Step 4: Simplify right side
    268,478.70x = 36,637,207,363.14
  5. Step 5: Solve for x
    x = 36,637,207,363.14/268,478.70
  6. Step 6: Final answer
    x = 136,462.25

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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.