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Finding the Fourth Proportional to 256,981.60, 385,509.12 and 79,503.76

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Solution

The fourth proportional to 256,981.60, 385,509.12 and 79,503.76 is: 119,267.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,981.60 : 385,509.12 = 79,503.76 : x
  2. Step 2: Convert to fraction form
    256,981.60/385,509.12 = 79,503.76/x
  3. Step 3: Cross multiply
    256,981.60x = 385,509.12 × 79,503.76
  4. Step 4: Simplify right side
    256,981.60x = 30,649,424,554.29
  5. Step 5: Solve for x
    x = 30,649,424,554.29/256,981.60
  6. Step 6: Final answer
    x = 119,267.00

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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.