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Finding the Fourth Proportional to 207,690, 286,613.40 and 121,699.74

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Solution

The fourth proportional to 207,690, 286,613.40 and 121,699.74 is: 167,946.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,690 : 286,613.40 = 121,699.74 : x
  2. Step 2: Convert to fraction form
    207,690/286,613.40 = 121,699.74/x
  3. Step 3: Cross multiply
    207,690x = 286,613.40 × 121,699.74
  4. Step 4: Simplify right side
    207,690x = 34,880,776,260.52
  5. Step 5: Solve for x
    x = 34,880,776,260.52/207,690
  6. Step 6: Final answer
    x = 167,946.34

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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.