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Finding the Fourth Proportional to 390,739.04, 585,713.28 and 154,248.20

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Solution

The fourth proportional to 390,739.04, 585,713.28 and 154,248.20 is: 231,216.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,739.04 : 585,713.28 = 154,248.20 : x
  2. Step 2: Convert to fraction form
    390,739.04/585,713.28 = 154,248.20/x
  3. Step 3: Cross multiply
    390,739.04x = 585,713.28 × 154,248.20
  4. Step 4: Simplify right side
    390,739.04x = 90,345,219,156.10
  5. Step 5: Solve for x
    x = 90,345,219,156.10/390,739.04
  6. Step 6: Final answer
    x = 231,216.26

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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.