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Finding the Fourth Proportional to 390,722.34, 539,042.66 and 245,442.76

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Solution

The fourth proportional to 390,722.34, 539,042.66 and 245,442.76 is: 338,614.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,722.34 : 539,042.66 = 245,442.76 : x
  2. Step 2: Convert to fraction form
    390,722.34/539,042.66 = 245,442.76/x
  3. Step 3: Cross multiply
    390,722.34x = 539,042.66 × 245,442.76
  4. Step 4: Simplify right side
    390,722.34x = 132,304,118,228.14
  5. Step 5: Solve for x
    x = 132,304,118,228.14/390,722.34
  6. Step 6: Final answer
    x = 338,614.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.