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Finding the Fourth Proportional to 78,353.16, 117,477.54 and 28,426.78

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Solution

The fourth proportional to 78,353.16, 117,477.54 and 28,426.78 is: 42,621.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,353.16 : 117,477.54 = 28,426.78 : x
  2. Step 2: Convert to fraction form
    78,353.16/117,477.54 = 28,426.78/x
  3. Step 3: Cross multiply
    78,353.16x = 117,477.54 × 28,426.78
  4. Step 4: Simplify right side
    78,353.16x = 3,339,508,331.37
  5. Step 5: Solve for x
    x = 3,339,508,331.37/78,353.16
  6. Step 6: Final answer
    x = 42,621.24

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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.