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Finding the Fourth Proportional to 991,807.20, 1,487,710.80 and 693,208.80

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Solution

The fourth proportional to 991,807.20, 1,487,710.80 and 693,208.80 is: 1,039,813.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,807.20 : 1,487,710.80 = 693,208.80 : x
  2. Step 2: Convert to fraction form
    991,807.20/1,487,710.80 = 693,208.80/x
  3. Step 3: Cross multiply
    991,807.20x = 1,487,710.80 × 693,208.80
  4. Step 4: Simplify right side
    991,807.20x = 1,031,294,218,415.04
  5. Step 5: Solve for x
    x = 1,031,294,218,415.04/991,807.20
  6. Step 6: Final answer
    x = 1,039,813.20

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Why These Related Problems?

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