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Finding the Fourth Proportional to 65,813.80, 98,720.70 and 18,428.80

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Solution

The fourth proportional to 65,813.80, 98,720.70 and 18,428.80 is: 27,643.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,813.80 : 98,720.70 = 18,428.80 : x
  2. Step 2: Convert to fraction form
    65,813.80/98,720.70 = 18,428.80/x
  3. Step 3: Cross multiply
    65,813.80x = 98,720.70 × 18,428.80
  4. Step 4: Simplify right side
    65,813.80x = 1,819,304,036.16
  5. Step 5: Solve for x
    x = 1,819,304,036.16/65,813.80
  6. Step 6: Final answer
    x = 27,643.20

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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.