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Finding the Fourth Proportional to 645,248.81, 890,397.07 and 354,880.51

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Solution

The fourth proportional to 645,248.81, 890,397.07 and 354,880.51 is: 489,709.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,248.81 : 890,397.07 = 354,880.51 : x
  2. Step 2: Convert to fraction form
    645,248.81/890,397.07 = 354,880.51/x
  3. Step 3: Cross multiply
    645,248.81x = 890,397.07 × 354,880.51
  4. Step 4: Simplify right side
    645,248.81x = 315,984,566,304.11
  5. Step 5: Solve for x
    x = 315,984,566,304.11/645,248.81
  6. Step 6: Final answer
    x = 489,709.65

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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.