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Finding the Fourth Proportional to 74,280.78, 102,507.12 and 40,746.78

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Solution

The fourth proportional to 74,280.78, 102,507.12 and 40,746.78 is: 56,230.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,280.78 : 102,507.12 = 40,746.78 : x
  2. Step 2: Convert to fraction form
    74,280.78/102,507.12 = 40,746.78/x
  3. Step 3: Cross multiply
    74,280.78x = 102,507.12 × 40,746.78
  4. Step 4: Simplify right side
    74,280.78x = 4,176,835,067.07
  5. Step 5: Solve for x
    x = 4,176,835,067.07/74,280.78
  6. Step 6: Final answer
    x = 56,230.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.