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Finding the Fourth Proportional to 265,475.70, 398,213.55 and 78,487.20

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Solution

The fourth proportional to 265,475.70, 398,213.55 and 78,487.20 is: 117,730.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,475.70 : 398,213.55 = 78,487.20 : x
  2. Step 2: Convert to fraction form
    265,475.70/398,213.55 = 78,487.20/x
  3. Step 3: Cross multiply
    265,475.70x = 398,213.55 × 78,487.20
  4. Step 4: Simplify right side
    265,475.70x = 31,254,666,541.56
  5. Step 5: Solve for x
    x = 31,254,666,541.56/265,475.70
  6. Step 6: Final answer
    x = 117,730.80

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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.