Home / 81,478.64-112,445-45,680.16

Finding the Fourth Proportional to 81,478.64, 112,445 and 45,680.16

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Solution

The fourth proportional to 81,478.64, 112,445 and 45,680.16 is: 63,041.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,478.64 : 112,445 = 45,680.16 : x
  2. Step 2: Convert to fraction form
    81,478.64/112,445 = 45,680.16/x
  3. Step 3: Cross multiply
    81,478.64x = 112,445 × 45,680.16
  4. Step 4: Simplify right side
    81,478.64x = 5,136,505,591.20
  5. Step 5: Solve for x
    x = 5,136,505,591.20/81,478.64
  6. Step 6: Final answer
    x = 63,041.13

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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.