Home / 20,830.30-31,248.40-7,681.64

Finding the Fourth Proportional to 20,830.30, 31,248.40 and 7,681.64

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Solution

The fourth proportional to 20,830.30, 31,248.40 and 7,681.64 is: 11,523.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.30 : 31,248.40 = 7,681.64 : x
  2. Step 2: Convert to fraction form
    20,830.30/31,248.40 = 7,681.64/x
  3. Step 3: Cross multiply
    20,830.30x = 31,248.40 × 7,681.64
  4. Step 4: Simplify right side
    20,830.30x = 240,038,959.38
  5. Step 5: Solve for x
    x = 240,038,959.38/20,830.30
  6. Step 6: Final answer
    x = 11,523.55

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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.