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Finding the Fourth Proportional to 78,219.20, 117,328.80 and 25,630.40

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Solution

The fourth proportional to 78,219.20, 117,328.80 and 25,630.40 is: 38,445.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,219.20 : 117,328.80 = 25,630.40 : x
  2. Step 2: Convert to fraction form
    78,219.20/117,328.80 = 25,630.40/x
  3. Step 3: Cross multiply
    78,219.20x = 117,328.80 × 25,630.40
  4. Step 4: Simplify right side
    78,219.20x = 3,007,184,075.52
  5. Step 5: Solve for x
    x = 3,007,184,075.52/78,219.20
  6. Step 6: Final answer
    x = 38,445.60

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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.