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Finding the Fourth Proportional to 390,881.80, 586,517.10 and 154,232.20

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Solution

The fourth proportional to 390,881.80, 586,517.10 and 154,232.20 is: 231,425.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,881.80 : 586,517.10 = 154,232.20 : x
  2. Step 2: Convert to fraction form
    390,881.80/586,517.10 = 154,232.20/x
  3. Step 3: Cross multiply
    390,881.80x = 586,517.10 × 154,232.20
  4. Step 4: Simplify right side
    390,881.80x = 90,459,822,670.62
  5. Step 5: Solve for x
    x = 90,459,822,670.62/390,881.80
  6. Step 6: Final answer
    x = 231,425.01

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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.