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Finding the Fourth Proportional to 257,415.40, 386,123.10 and 67,875.40

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Solution

The fourth proportional to 257,415.40, 386,123.10 and 67,875.40 is: 101,813.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,415.40 : 386,123.10 = 67,875.40 : x
  2. Step 2: Convert to fraction form
    257,415.40/386,123.10 = 67,875.40/x
  3. Step 3: Cross multiply
    257,415.40x = 386,123.10 × 67,875.40
  4. Step 4: Simplify right side
    257,415.40x = 26,208,259,861.74
  5. Step 5: Solve for x
    x = 26,208,259,861.74/257,415.40
  6. Step 6: Final answer
    x = 101,813.10

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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.