Home / 30,555.79-42,088.11-21,587.72

Finding the Fourth Proportional to 30,555.79, 42,088.11 and 21,587.72

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Solution

The fourth proportional to 30,555.79, 42,088.11 and 21,587.72 is: 29,735.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,555.79 : 42,088.11 = 21,587.72 : x
  2. Step 2: Convert to fraction form
    30,555.79/42,088.11 = 21,587.72/x
  3. Step 3: Cross multiply
    30,555.79x = 42,088.11 × 21,587.72
  4. Step 4: Simplify right side
    30,555.79x = 908,586,334.01
  5. Step 5: Solve for x
    x = 908,586,334.01/30,555.79
  6. Step 6: Final answer
    x = 29,735.32

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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.