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Finding the Fourth Proportional to 645,322.65, 890,508.63 and 358,836.57

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Solution

The fourth proportional to 645,322.65, 890,508.63 and 358,836.57 is: 495,174.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,322.65 : 890,508.63 = 358,836.57 : x
  2. Step 2: Convert to fraction form
    645,322.65/890,508.63 = 358,836.57/x
  3. Step 3: Cross multiply
    645,322.65x = 890,508.63 × 358,836.57
  4. Step 4: Simplify right side
    645,322.65x = 319,547,062,344.60
  5. Step 5: Solve for x
    x = 319,547,062,344.60/645,322.65
  6. Step 6: Final answer
    x = 495,174.10

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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.