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Finding the Fourth Proportional to 145,411.20, 218,116.80 and 86,428.80

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Solution

The fourth proportional to 145,411.20, 218,116.80 and 86,428.80 is: 129,643.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,411.20 : 218,116.80 = 86,428.80 : x
  2. Step 2: Convert to fraction form
    145,411.20/218,116.80 = 86,428.80/x
  3. Step 3: Cross multiply
    145,411.20x = 218,116.80 × 86,428.80
  4. Step 4: Simplify right side
    145,411.20x = 18,851,573,283.84
  5. Step 5: Solve for x
    x = 18,851,573,283.84/145,411.20
  6. Step 6: Final answer
    x = 129,643.20

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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.