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Finding the Fourth Proportional to 1,390,428, 1,918,790.64 and 754,524

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Solution

The fourth proportional to 1,390,428, 1,918,790.64 and 754,524 is: 1,041,243.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,428 : 1,918,790.64 = 754,524 : x
  2. Step 2: Convert to fraction form
    1,390,428/1,918,790.64 = 754,524/x
  3. Step 3: Cross multiply
    1,390,428x = 1,918,790.64 × 754,524
  4. Step 4: Simplify right side
    1,390,428x = 1,447,773,588,855.36
  5. Step 5: Solve for x
    x = 1,447,773,588,855.36/1,390,428
  6. Step 6: Final answer
    x = 1,041,243.12

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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.