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Finding the Fourth Proportional to 100,485.92, 138,642.18 and 64,696.64

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Solution

The fourth proportional to 100,485.92, 138,642.18 and 64,696.64 is: 89,263.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,485.92 : 138,642.18 = 64,696.64 : x
  2. Step 2: Convert to fraction form
    100,485.92/138,642.18 = 64,696.64/x
  3. Step 3: Cross multiply
    100,485.92x = 138,642.18 × 64,696.64
  4. Step 4: Simplify right side
    100,485.92x = 8,969,683,208.28
  5. Step 5: Solve for x
    x = 8,969,683,208.28/100,485.92
  6. Step 6: Final answer
    x = 89,263.08

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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.