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Finding the Fourth Proportional to 11,390.71, 15,707.68 and 7,613.89

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Solution

The fourth proportional to 11,390.71, 15,707.68 and 7,613.89 is: 10,499.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,390.71 : 15,707.68 = 7,613.89 : x
  2. Step 2: Convert to fraction form
    11,390.71/15,707.68 = 7,613.89/x
  3. Step 3: Cross multiply
    11,390.71x = 15,707.68 × 7,613.89
  4. Step 4: Simplify right side
    11,390.71x = 119,596,547.68
  5. Step 5: Solve for x
    x = 119,596,547.68/11,390.71
  6. Step 6: Final answer
    x = 10,499.48

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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.