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Finding the Fourth Proportional to 78,477.20, 117,715.80 and 19,312.40

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Solution

The fourth proportional to 78,477.20, 117,715.80 and 19,312.40 is: 28,968.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,477.20 : 117,715.80 = 19,312.40 : x
  2. Step 2: Convert to fraction form
    78,477.20/117,715.80 = 19,312.40/x
  3. Step 3: Cross multiply
    78,477.20x = 117,715.80 × 19,312.40
  4. Step 4: Simplify right side
    78,477.20x = 2,273,374,615.92
  5. Step 5: Solve for x
    x = 2,273,374,615.92/78,477.20
  6. Step 6: Final answer
    x = 28,968.60

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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.