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Finding the Fourth Proportional to 1,398,133.80, 1,928,402.10 and 913,922.28

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Solution

The fourth proportional to 1,398,133.80, 1,928,402.10 and 913,922.28 is: 1,260,544.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398,133.80 : 1,928,402.10 = 913,922.28 : x
  2. Step 2: Convert to fraction form
    1,398,133.80/1,928,402.10 = 913,922.28/x
  3. Step 3: Cross multiply
    1,398,133.80x = 1,928,402.10 × 913,922.28
  4. Step 4: Simplify right side
    1,398,133.80x = 1,762,409,643,988.79
  5. Step 5: Solve for x
    x = 1,762,409,643,988.79/1,398,133.80
  6. Step 6: Final answer
    x = 1,260,544.34

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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.