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Finding the Fourth Proportional to 9,890.79, 13,643.15 and 6,115.11

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Solution

The fourth proportional to 9,890.79, 13,643.15 and 6,115.11 is: 8,435.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,890.79 : 13,643.15 = 6,115.11 : x
  2. Step 2: Convert to fraction form
    9,890.79/13,643.15 = 6,115.11/x
  3. Step 3: Cross multiply
    9,890.79x = 13,643.15 × 6,115.11
  4. Step 4: Simplify right side
    9,890.79x = 83,429,332.42
  5. Step 5: Solve for x
    x = 83,429,332.42/9,890.79
  6. Step 6: Final answer
    x = 8,435.05

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Half scale
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Double scale
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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.