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Finding the Fourth Proportional to 390,753.27, 539,268.48 and 218,688.48

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Solution

The fourth proportional to 390,753.27, 539,268.48 and 218,688.48 is: 301,806.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,753.27 : 539,268.48 = 218,688.48 : x
  2. Step 2: Convert to fraction form
    390,753.27/539,268.48 = 218,688.48/x
  3. Step 3: Cross multiply
    390,753.27x = 539,268.48 × 218,688.48
  4. Step 4: Simplify right side
    390,753.27x = 117,931,804,203.11
  5. Step 5: Solve for x
    x = 117,931,804,203.11/390,753.27
  6. Step 6: Final answer
    x = 301,806.31

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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.