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Finding the Fourth Proportional to 390,864.16, 539,347.12 and 218,791.72

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Solution

The fourth proportional to 390,864.16, 539,347.12 and 218,791.72 is: 301,907.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,864.16 : 539,347.12 = 218,791.72 : x
  2. Step 2: Convert to fraction form
    390,864.16/539,347.12 = 218,791.72/x
  3. Step 3: Cross multiply
    390,864.16x = 539,347.12 × 218,791.72
  4. Step 4: Simplify right side
    390,864.16x = 118,004,684,061.85
  5. Step 5: Solve for x
    x = 118,004,684,061.85/390,864.16
  6. Step 6: Final answer
    x = 301,907.15

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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.