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Finding the Fourth Proportional to 78,399.80, 117,599.70 and 77,962.40

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Solution

The fourth proportional to 78,399.80, 117,599.70 and 77,962.40 is: 116,943.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,399.80 : 117,599.70 = 77,962.40 : x
  2. Step 2: Convert to fraction form
    78,399.80/117,599.70 = 77,962.40/x
  3. Step 3: Cross multiply
    78,399.80x = 117,599.70 × 77,962.40
  4. Step 4: Simplify right side
    78,399.80x = 9,168,354,851.28
  5. Step 5: Solve for x
    x = 9,168,354,851.28/78,399.80
  6. Step 6: Final answer
    x = 116,943.60

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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.