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Finding the Fourth Proportional to 640,369.76, 883,686.40 and 368,479.70

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Solution

The fourth proportional to 640,369.76, 883,686.40 and 368,479.70 is: 508,488.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,369.76 : 883,686.40 = 368,479.70 : x
  2. Step 2: Convert to fraction form
    640,369.76/883,686.40 = 368,479.70/x
  3. Step 3: Cross multiply
    640,369.76x = 883,686.40 × 368,479.70
  4. Step 4: Simplify right side
    640,369.76x = 325,620,499,566.08
  5. Step 5: Solve for x
    x = 325,620,499,566.08/640,369.76
  6. Step 6: Final answer
    x = 508,488.25

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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.