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Finding the Fourth Proportional to 28,574.60, 42,886.20 and 12,803.90

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Solution

The fourth proportional to 28,574.60, 42,886.20 and 12,803.90 is: 19,216.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,574.60 : 42,886.20 = 12,803.90 : x
  2. Step 2: Convert to fraction form
    28,574.60/42,886.20 = 12,803.90/x
  3. Step 3: Cross multiply
    28,574.60x = 42,886.20 × 12,803.90
  4. Step 4: Simplify right side
    28,574.60x = 549,110,616.18
  5. Step 5: Solve for x
    x = 549,110,616.18/28,574.60
  6. Step 6: Final answer
    x = 19,216.74

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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.