Home / 30,720.16-42,411.90-28,948.72

Finding the Fourth Proportional to 30,720.16, 42,411.90 and 28,948.72

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Solution

The fourth proportional to 30,720.16, 42,411.90 and 28,948.72 is: 39,966.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,720.16 : 42,411.90 = 28,948.72 : x
  2. Step 2: Convert to fraction form
    30,720.16/42,411.90 = 28,948.72/x
  3. Step 3: Cross multiply
    30,720.16x = 42,411.90 × 28,948.72
  4. Step 4: Simplify right side
    30,720.16x = 1,227,770,217.77
  5. Step 5: Solve for x
    x = 1,227,770,217.77/30,720.16
  6. Step 6: Final answer
    x = 39,966.27

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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.