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Finding the Fourth Proportional to 1,187,978.40, 1,780,655.40 and 655,881.30

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Solution

The fourth proportional to 1,187,978.40, 1,780,655.40 and 655,881.30 is: 983,097.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187,978.40 : 1,780,655.40 = 655,881.30 : x
  2. Step 2: Convert to fraction form
    1,187,978.40/1,780,655.40 = 655,881.30/x
  3. Step 3: Cross multiply
    1,187,978.40x = 1,780,655.40 × 655,881.30
  4. Step 4: Simplify right side
    1,187,978.40x = 1,167,898,578,604.02
  5. Step 5: Solve for x
    x = 1,167,898,578,604.02/1,187,978.40
  6. Step 6: Final answer
    x = 983,097.49

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