Home / 29,478.16-40,639.08-21,520.72

Finding the Fourth Proportional to 29,478.16, 40,639.08 and 21,520.72

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Solution

The fourth proportional to 29,478.16, 40,639.08 and 21,520.72 is: 29,668.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,478.16 : 40,639.08 = 21,520.72 : x
  2. Step 2: Convert to fraction form
    29,478.16/40,639.08 = 21,520.72/x
  3. Step 3: Cross multiply
    29,478.16x = 40,639.08 × 21,520.72
  4. Step 4: Simplify right side
    29,478.16x = 874,582,261.74
  5. Step 5: Solve for x
    x = 874,582,261.74/29,478.16
  6. Step 6: Final answer
    x = 29,668.82

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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.