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Finding the Fourth Proportional to 612,989.37, 917,712.59 and 388,603.17

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Solution

The fourth proportional to 612,989.37, 917,712.59 and 388,603.17 is: 581,781.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,989.37 : 917,712.59 = 388,603.17 : x
  2. Step 2: Convert to fraction form
    612,989.37/917,712.59 = 388,603.17/x
  3. Step 3: Cross multiply
    612,989.37x = 917,712.59 × 388,603.17
  4. Step 4: Simplify right side
    612,989.37x = 356,626,019,679.89
  5. Step 5: Solve for x
    x = 356,626,019,679.89/612,989.37
  6. Step 6: Final answer
    x = 581,781.74

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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.