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Finding the Fourth Proportional to 390,643.02, 539,098.74 and 220,873.50

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Solution

The fourth proportional to 390,643.02, 539,098.74 and 220,873.50 is: 304,811.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,643.02 : 539,098.74 = 220,873.50 : x
  2. Step 2: Convert to fraction form
    390,643.02/539,098.74 = 220,873.50/x
  3. Step 3: Cross multiply
    390,643.02x = 539,098.74 × 220,873.50
  4. Step 4: Simplify right side
    390,643.02x = 119,072,625,549.39
  5. Step 5: Solve for x
    x = 119,072,625,549.39/390,643.02
  6. Step 6: Final answer
    x = 304,811.86

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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.