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Finding the Fourth Proportional to 1,390,422, 1,918,782.36 and 754,518

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Solution

The fourth proportional to 1,390,422, 1,918,782.36 and 754,518 is: 1,041,234.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,422 : 1,918,782.36 = 754,518 : x
  2. Step 2: Convert to fraction form
    1,390,422/1,918,782.36 = 754,518/x
  3. Step 3: Cross multiply
    1,390,422x = 1,918,782.36 × 754,518
  4. Step 4: Simplify right side
    1,390,422x = 1,447,755,828,702.48
  5. Step 5: Solve for x
    x = 1,447,755,828,702.48/1,390,422
  6. Step 6: Final answer
    x = 1,041,234.84

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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.