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Finding the Fourth Proportional to 20,875.56, 28,808.28 and 11,445

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Solution

The fourth proportional to 20,875.56, 28,808.28 and 11,445 is: 15,794.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,875.56 : 28,808.28 = 11,445 : x
  2. Step 2: Convert to fraction form
    20,875.56/28,808.28 = 11,445/x
  3. Step 3: Cross multiply
    20,875.56x = 28,808.28 × 11,445
  4. Step 4: Simplify right side
    20,875.56x = 329,710,764.60
  5. Step 5: Solve for x
    x = 329,710,764.60/20,875.56
  6. Step 6: Final answer
    x = 15,794.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.