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Finding the Fourth Proportional to 399,598.80, 550,323.72 and 390,889.68

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Solution

The fourth proportional to 399,598.80, 550,323.72 and 390,889.68 is: 538,329.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,598.80 : 550,323.72 = 390,889.68 : x
  2. Step 2: Convert to fraction form
    399,598.80/550,323.72 = 390,889.68/x
  3. Step 3: Cross multiply
    399,598.80x = 550,323.72 × 390,889.68
  4. Step 4: Simplify right side
    399,598.80x = 215,115,862,807.21
  5. Step 5: Solve for x
    x = 215,115,862,807.21/399,598.80
  6. Step 6: Final answer
    x = 538,329.60

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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.