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Finding the Fourth Proportional to 145,970.45, 201,439.13 and 78,902.45

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Solution

The fourth proportional to 145,970.45, 201,439.13 and 78,902.45 is: 108,885.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,970.45 : 201,439.13 = 78,902.45 : x
  2. Step 2: Convert to fraction form
    145,970.45/201,439.13 = 78,902.45/x
  3. Step 3: Cross multiply
    145,970.45x = 201,439.13 × 78,902.45
  4. Step 4: Simplify right side
    145,970.45x = 15,894,039,481.16
  5. Step 5: Solve for x
    x = 15,894,039,481.16/145,970.45
  6. Step 6: Final answer
    x = 108,885.33

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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.