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Finding the Fourth Proportional to 423,421.20, 634,927.68 and 245,979

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Solution

The fourth proportional to 423,421.20, 634,927.68 and 245,979 is: 368,849.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,421.20 : 634,927.68 = 245,979 : x
  2. Step 2: Convert to fraction form
    423,421.20/634,927.68 = 245,979/x
  3. Step 3: Cross multiply
    423,421.20x = 634,927.68 × 245,979
  4. Step 4: Simplify right side
    423,421.20x = 156,178,875,798.72
  5. Step 5: Solve for x
    x = 156,178,875,798.72/423,421.20
  6. Step 6: Final answer
    x = 368,849.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.