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Finding the Fourth Proportional to 390,926.40, 539,536.32 and 247,699.77

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Solution

The fourth proportional to 390,926.40, 539,536.32 and 247,699.77 is: 341,862.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,926.40 : 539,536.32 = 247,699.77 : x
  2. Step 2: Convert to fraction form
    390,926.40/539,536.32 = 247,699.77/x
  3. Step 3: Cross multiply
    390,926.40x = 539,536.32 × 247,699.77
  4. Step 4: Simplify right side
    390,926.40x = 133,643,022,370.65
  5. Step 5: Solve for x
    x = 133,643,022,370.65/390,926.40
  6. Step 6: Final answer
    x = 341,862.36

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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.