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Finding the Fourth Proportional to 655,831.77, 983,599.98 and 428,055.72

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Solution

The fourth proportional to 655,831.77, 983,599.98 and 428,055.72 is: 641,987.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    655,831.77 : 983,599.98 = 428,055.72 : x
  2. Step 2: Convert to fraction form
    655,831.77/983,599.98 = 428,055.72/x
  3. Step 3: Cross multiply
    655,831.77x = 983,599.98 × 428,055.72
  4. Step 4: Simplify right side
    655,831.77x = 421,035,597,630.89
  5. Step 5: Solve for x
    x = 421,035,597,630.89/655,831.77
  6. Step 6: Final answer
    x = 641,987.19

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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.