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Finding the Fourth Proportional to 1,288,651, 1,778,280.80 and 772,689.68

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Solution

The fourth proportional to 1,288,651, 1,778,280.80 and 772,689.68 is: 1,066,277.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288,651 : 1,778,280.80 = 772,689.68 : x
  2. Step 2: Convert to fraction form
    1,288,651/1,778,280.80 = 772,689.68/x
  3. Step 3: Cross multiply
    1,288,651x = 1,778,280.80 × 772,689.68
  4. Step 4: Simplify right side
    1,288,651x = 1,374,059,222,302.14
  5. Step 5: Solve for x
    x = 1,374,059,222,302.14/1,288,651
  6. Step 6: Final answer
    x = 1,066,277.23

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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.