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Finding the Fourth Proportional to 72,405.64, 100,011.54 and 65,329.48

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Solution

The fourth proportional to 72,405.64, 100,011.54 and 65,329.48 is: 90,237.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,405.64 : 100,011.54 = 65,329.48 : x
  2. Step 2: Convert to fraction form
    72,405.64/100,011.54 = 65,329.48/x
  3. Step 3: Cross multiply
    72,405.64x = 100,011.54 × 65,329.48
  4. Step 4: Simplify right side
    72,405.64x = 6,533,701,902.20
  5. Step 5: Solve for x
    x = 6,533,701,902.20/72,405.64
  6. Step 6: Final answer
    x = 90,237.47

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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.