Home / 15,420.27-21,280.39-9,368.46

Finding the Fourth Proportional to 15,420.27, 21,280.39 and 9,368.46

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Solution

The fourth proportional to 15,420.27, 21,280.39 and 9,368.46 is: 12,928.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.27 : 21,280.39 = 9,368.46 : x
  2. Step 2: Convert to fraction form
    15,420.27/21,280.39 = 9,368.46/x
  3. Step 3: Cross multiply
    15,420.27x = 21,280.39 × 9,368.46
  4. Step 4: Simplify right side
    15,420.27x = 199,364,459.08
  5. Step 5: Solve for x
    x = 199,364,459.08/15,420.27
  6. Step 6: Final answer
    x = 12,928.72

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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.