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Finding the Fourth Proportional to 318,959.40, 478,439.10 and 141,812.40

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Solution

The fourth proportional to 318,959.40, 478,439.10 and 141,812.40 is: 212,718.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,959.40 : 478,439.10 = 141,812.40 : x
  2. Step 2: Convert to fraction form
    318,959.40/478,439.10 = 141,812.40/x
  3. Step 3: Cross multiply
    318,959.40x = 478,439.10 × 141,812.40
  4. Step 4: Simplify right side
    318,959.40x = 67,848,597,024.84
  5. Step 5: Solve for x
    x = 67,848,597,024.84/318,959.40
  6. Step 6: Final answer
    x = 212,718.60

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1.5x scale

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.