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Finding the Fourth Proportional to 720,319.68, 991,172.52 and 698,405.76

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Solution

The fourth proportional to 720,319.68, 991,172.52 and 698,405.76 is: 961,018.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,319.68 : 991,172.52 = 698,405.76 : x
  2. Step 2: Convert to fraction form
    720,319.68/991,172.52 = 698,405.76/x
  3. Step 3: Cross multiply
    720,319.68x = 991,172.52 × 698,405.76
  4. Step 4: Simplify right side
    720,319.68x = 692,240,597,121.72
  5. Step 5: Solve for x
    x = 692,240,597,121.72/720,319.68
  6. Step 6: Final answer
    x = 961,018.58

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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.