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Finding the Fourth Proportional to 15,374.40, 21,218.93 and 9,405.10

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Solution

The fourth proportional to 15,374.40, 21,218.93 and 9,405.10 is: 12,980.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,374.40 : 21,218.93 = 9,405.10 : x
  2. Step 2: Convert to fraction form
    15,374.40/21,218.93 = 9,405.10/x
  3. Step 3: Cross multiply
    15,374.40x = 21,218.93 × 9,405.10
  4. Step 4: Simplify right side
    15,374.40x = 199,566,158.54
  5. Step 5: Solve for x
    x = 199,566,158.54/15,374.40
  6. Step 6: Final answer
    x = 12,980.42

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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.