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Finding the Fourth Proportional to 81,441.65, 112,393.98 and 45,643.20

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Solution

The fourth proportional to 81,441.65, 112,393.98 and 45,643.20 is: 62,990.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,441.65 : 112,393.98 = 45,643.20 : x
  2. Step 2: Convert to fraction form
    81,441.65/112,393.98 = 45,643.20/x
  3. Step 3: Cross multiply
    81,441.65x = 112,393.98 × 45,643.20
  4. Step 4: Simplify right side
    81,441.65x = 5,130,020,486.46
  5. Step 5: Solve for x
    x = 5,130,020,486.46/81,441.65
  6. Step 6: Final answer
    x = 62,990.13

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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.