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Finding the Fourth Proportional to 121,420.60, 182,130.90 and 79,430.20

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Solution

The fourth proportional to 121,420.60, 182,130.90 and 79,430.20 is: 119,145.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,420.60 : 182,130.90 = 79,430.20 : x
  2. Step 2: Convert to fraction form
    121,420.60/182,130.90 = 79,430.20/x
  3. Step 3: Cross multiply
    121,420.60x = 182,130.90 × 79,430.20
  4. Step 4: Simplify right side
    121,420.60x = 14,466,693,813.18
  5. Step 5: Solve for x
    x = 14,466,693,813.18/121,420.60
  6. Step 6: Final answer
    x = 119,145.30

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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.