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Finding the Fourth Proportional to 72,018.40, 107,935.80 and 40,428.40

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Solution

The fourth proportional to 72,018.40, 107,935.80 and 40,428.40 is: 60,591.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,018.40 : 107,935.80 = 40,428.40 : x
  2. Step 2: Convert to fraction form
    72,018.40/107,935.80 = 40,428.40/x
  3. Step 3: Cross multiply
    72,018.40x = 107,935.80 × 40,428.40
  4. Step 4: Simplify right side
    72,018.40x = 4,363,671,696.72
  5. Step 5: Solve for x
    x = 4,363,671,696.72/72,018.40
  6. Step 6: Final answer
    x = 60,591.07

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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.