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Finding the Fourth Proportional to 78,420.20, 117,630.30 and 77,124.20

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Solution

The fourth proportional to 78,420.20, 117,630.30 and 77,124.20 is: 115,686.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,420.20 : 117,630.30 = 77,124.20 : x
  2. Step 2: Convert to fraction form
    78,420.20/117,630.30 = 77,124.20/x
  3. Step 3: Cross multiply
    78,420.20x = 117,630.30 × 77,124.20
  4. Step 4: Simplify right side
    78,420.20x = 9,072,142,783.26
  5. Step 5: Solve for x
    x = 9,072,142,783.26/78,420.20
  6. Step 6: Final answer
    x = 115,686.30

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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.