Home / 28,155.72-42,248.16-20,428.32

Finding the Fourth Proportional to 28,155.72, 42,248.16 and 20,428.32

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Solution

The fourth proportional to 28,155.72, 42,248.16 and 20,428.32 is: 30,653.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,155.72 : 42,248.16 = 20,428.32 : x
  2. Step 2: Convert to fraction form
    28,155.72/42,248.16 = 20,428.32/x
  3. Step 3: Cross multiply
    28,155.72x = 42,248.16 × 20,428.32
  4. Step 4: Simplify right side
    28,155.72x = 863,058,931.89
  5. Step 5: Solve for x
    x = 863,058,931.89/28,155.72
  6. Step 6: Final answer
    x = 30,653.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.