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Finding the Fourth Proportional to 78,280.83, 117,420.84 and 19,116.81

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Solution

The fourth proportional to 78,280.83, 117,420.84 and 19,116.81 is: 28,675.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,280.83 : 117,420.84 = 19,116.81 : x
  2. Step 2: Convert to fraction form
    78,280.83/117,420.84 = 19,116.81/x
  3. Step 3: Cross multiply
    78,280.83x = 117,420.84 × 19,116.81
  4. Step 4: Simplify right side
    78,280.83x = 2,244,711,888.32
  5. Step 5: Solve for x
    x = 2,244,711,888.32/78,280.83
  6. Step 6: Final answer
    x = 28,675.12

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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.