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Finding the Fourth Proportional to 714,782.95, 986,417.70 and 388,109.85

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Solution

The fourth proportional to 714,782.95, 986,417.70 and 388,109.85 is: 535,600.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,782.95 : 986,417.70 = 388,109.85 : x
  2. Step 2: Convert to fraction form
    714,782.95/986,417.70 = 388,109.85/x
  3. Step 3: Cross multiply
    714,782.95x = 986,417.70 × 388,109.85
  4. Step 4: Simplify right side
    714,782.95x = 382,838,420,429.87
  5. Step 5: Solve for x
    x = 382,838,420,429.87/714,782.95
  6. Step 6: Final answer
    x = 535,600.94

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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.