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Finding the Fourth Proportional to 390,655.80, 539,154.72 and 218,583.48

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Solution

The fourth proportional to 390,655.80, 539,154.72 and 218,583.48 is: 301,673.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,655.80 : 539,154.72 = 218,583.48 : x
  2. Step 2: Convert to fraction form
    390,655.80/539,154.72 = 218,583.48/x
  3. Step 3: Cross multiply
    390,655.80x = 539,154.72 × 218,583.48
  4. Step 4: Simplify right side
    390,655.80x = 117,850,314,956.03
  5. Step 5: Solve for x
    x = 117,850,314,956.03/390,655.80
  6. Step 6: Final answer
    x = 301,673.02

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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.