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Finding the Fourth Proportional to 72,657.72, 100,316.58 and 64,977.16

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Solution

The fourth proportional to 72,657.72, 100,316.58 and 64,977.16 is: 89,712.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,657.72 : 100,316.58 = 64,977.16 : x
  2. Step 2: Convert to fraction form
    72,657.72/100,316.58 = 64,977.16/x
  3. Step 3: Cross multiply
    72,657.72x = 100,316.58 × 64,977.16
  4. Step 4: Simplify right side
    72,657.72x = 6,518,286,963.02
  5. Step 5: Solve for x
    x = 6,518,286,963.02/72,657.72
  6. Step 6: Final answer
    x = 89,712.24

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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.