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Finding the Fourth Proportional to 279,314.40, 418,988.88 and 138,931.68

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Solution

The fourth proportional to 279,314.40, 418,988.88 and 138,931.68 is: 208,406.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,314.40 : 418,988.88 = 138,931.68 : x
  2. Step 2: Convert to fraction form
    279,314.40/418,988.88 = 138,931.68/x
  3. Step 3: Cross multiply
    279,314.40x = 418,988.88 × 138,931.68
  4. Step 4: Simplify right side
    279,314.40x = 58,210,828,999.72
  5. Step 5: Solve for x
    x = 58,210,828,999.72/279,314.40
  6. Step 6: Final answer
    x = 208,406.12

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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.