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Finding the Fourth Proportional to 426,638.32, 640,307.28 and 216,336.40

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Solution

The fourth proportional to 426,638.32, 640,307.28 and 216,336.40 is: 324,681.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,638.32 : 640,307.28 = 216,336.40 : x
  2. Step 2: Convert to fraction form
    426,638.32/640,307.28 = 216,336.40/x
  3. Step 3: Cross multiply
    426,638.32x = 640,307.28 × 216,336.40
  4. Step 4: Simplify right side
    426,638.32x = 138,521,767,565.77
  5. Step 5: Solve for x
    x = 138,521,767,565.77/426,638.32
  6. Step 6: Final answer
    x = 324,681.97

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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.