Home / 30,787.47-42,423.95-21,230.28

Finding the Fourth Proportional to 30,787.47, 42,423.95 and 21,230.28

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Solution

The fourth proportional to 30,787.47, 42,423.95 and 21,230.28 is: 29,254.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,787.47 : 42,423.95 = 21,230.28 : x
  2. Step 2: Convert to fraction form
    30,787.47/42,423.95 = 21,230.28/x
  3. Step 3: Cross multiply
    30,787.47x = 42,423.95 × 21,230.28
  4. Step 4: Simplify right side
    30,787.47x = 900,672,231.05
  5. Step 5: Solve for x
    x = 900,672,231.05/30,787.47
  6. Step 6: Final answer
    x = 29,254.51

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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.