Home / 21,319.61-31,938.40-11,931.20

Finding the Fourth Proportional to 21,319.61, 31,938.40 and 11,931.20

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Solution

The fourth proportional to 21,319.61, 31,938.40 and 11,931.20 is: 17,873.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,319.61 : 31,938.40 = 11,931.20 : x
  2. Step 2: Convert to fraction form
    21,319.61/31,938.40 = 11,931.20/x
  3. Step 3: Cross multiply
    21,319.61x = 31,938.40 × 11,931.20
  4. Step 4: Simplify right side
    21,319.61x = 381,063,413.07
  5. Step 5: Solve for x
    x = 381,063,413.07/21,319.61
  6. Step 6: Final answer
    x = 17,873.85

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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.