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Finding the Fourth Proportional to 1,386,781.04, 1,913,721.18 and 774,938.84

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Solution

The fourth proportional to 1,386,781.04, 1,913,721.18 and 774,938.84 is: 1,069,395.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386,781.04 : 1,913,721.18 = 774,938.84 : x
  2. Step 2: Convert to fraction form
    1,386,781.04/1,913,721.18 = 774,938.84/x
  3. Step 3: Cross multiply
    1,386,781.04x = 1,913,721.18 × 774,938.84
  4. Step 4: Simplify right side
    1,386,781.04x = 1,483,016,861,744.03
  5. Step 5: Solve for x
    x = 1,483,016,861,744.03/1,386,781.04
  6. Step 6: Final answer
    x = 1,069,395.11

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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.