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Finding the Fourth Proportional to 78,321.51, 117,482.25 and 19,156.47

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Solution

The fourth proportional to 78,321.51, 117,482.25 and 19,156.47 is: 28,734.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,321.51 : 117,482.25 = 19,156.47 : x
  2. Step 2: Convert to fraction form
    78,321.51/117,482.25 = 19,156.47/x
  3. Step 3: Cross multiply
    78,321.51x = 117,482.25 × 19,156.47
  4. Step 4: Simplify right side
    78,321.51x = 2,250,545,197.66
  5. Step 5: Solve for x
    x = 2,250,545,197.66/78,321.51
  6. Step 6: Final answer
    x = 28,734.70

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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.