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Finding the Fourth Proportional to 218,859.40, 328,058.70 and 85,688.20

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Solution

The fourth proportional to 218,859.40, 328,058.70 and 85,688.20 is: 128,442.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,859.40 : 328,058.70 = 85,688.20 : x
  2. Step 2: Convert to fraction form
    218,859.40/328,058.70 = 85,688.20/x
  3. Step 3: Cross multiply
    218,859.40x = 328,058.70 × 85,688.20
  4. Step 4: Simplify right side
    218,859.40x = 28,110,759,497.34
  5. Step 5: Solve for x
    x = 28,110,759,497.34/218,859.40
  6. Step 6: Final answer
    x = 128,442.09

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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.