Home / 21,280.32-31,920.48-10,886.40

Finding the Fourth Proportional to 21,280.32, 31,920.48 and 10,886.40

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Solution

The fourth proportional to 21,280.32, 31,920.48 and 10,886.40 is: 16,329.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.32 : 31,920.48 = 10,886.40 : x
  2. Step 2: Convert to fraction form
    21,280.32/31,920.48 = 10,886.40/x
  3. Step 3: Cross multiply
    21,280.32x = 31,920.48 × 10,886.40
  4. Step 4: Simplify right side
    21,280.32x = 347,499,113.47
  5. Step 5: Solve for x
    x = 347,499,113.47/21,280.32
  6. Step 6: Final answer
    x = 16,329.60

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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.