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Finding the Fourth Proportional to 1,259,686.12, 1,890,621.07 and 661,070.20

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Solution

The fourth proportional to 1,259,686.12, 1,890,621.07 and 661,070.20 is: 992,178.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259,686.12 : 1,890,621.07 = 661,070.20 : x
  2. Step 2: Convert to fraction form
    1,259,686.12/1,890,621.07 = 661,070.20/x
  3. Step 3: Cross multiply
    1,259,686.12x = 1,890,621.07 × 661,070.20
  4. Step 4: Simplify right side
    1,259,686.12x = 1,249,833,248,869.11
  5. Step 5: Solve for x
    x = 1,249,833,248,869.11/1,259,686.12
  6. Step 6: Final answer
    x = 992,178.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.