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Finding the Fourth Proportional to 11,409.95, 15,740.78 and 7,158.12

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Solution

The fourth proportional to 11,409.95, 15,740.78 and 7,158.12 is: 9,875.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,409.95 : 15,740.78 = 7,158.12 : x
  2. Step 2: Convert to fraction form
    11,409.95/15,740.78 = 7,158.12/x
  3. Step 3: Cross multiply
    11,409.95x = 15,740.78 × 7,158.12
  4. Step 4: Simplify right side
    11,409.95x = 112,674,356.34
  5. Step 5: Solve for x
    x = 112,674,356.34/11,409.95
  6. Step 6: Final answer
    x = 9,875.10

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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.