Home / 645,431.16-890,688.78-358,937.40

Finding the Fourth Proportional to 645,431.16, 890,688.78 and 358,937.40

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Solution

The fourth proportional to 645,431.16, 890,688.78 and 358,937.40 is: 495,330.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,431.16 : 890,688.78 = 358,937.40 : x
  2. Step 2: Convert to fraction form
    645,431.16/890,688.78 = 358,937.40/x
  3. Step 3: Cross multiply
    645,431.16x = 890,688.78 × 358,937.40
  4. Step 4: Simplify right side
    645,431.16x = 319,701,514,902.37
  5. Step 5: Solve for x
    x = 319,701,514,902.37/645,431.16
  6. Step 6: Final answer
    x = 495,330.15

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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.