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Finding the Fourth Proportional to 390,654.40, 585,904.80 and 127,998.40

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Solution

The fourth proportional to 390,654.40, 585,904.80 and 127,998.40 is: 191,972.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,654.40 : 585,904.80 = 127,998.40 : x
  2. Step 2: Convert to fraction form
    390,654.40/585,904.80 = 127,998.40/x
  3. Step 3: Cross multiply
    390,654.40x = 585,904.80 × 127,998.40
  4. Step 4: Simplify right side
    390,654.40x = 74,994,876,952.32
  5. Step 5: Solve for x
    x = 74,994,876,952.32/390,654.40
  6. Step 6: Final answer
    x = 191,972.44

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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.