Home / 645,459.20-890,745.14-358,979.42

Finding the Fourth Proportional to 645,459.20, 890,745.14 and 358,979.42

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Solution

The fourth proportional to 645,459.20, 890,745.14 and 358,979.42 is: 495,397.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,459.20 : 890,745.14 = 358,979.42 : x
  2. Step 2: Convert to fraction form
    645,459.20/890,745.14 = 358,979.42/x
  3. Step 3: Cross multiply
    645,459.20x = 890,745.14 × 358,979.42
  4. Step 4: Simplify right side
    645,459.20x = 319,759,173,725.02
  5. Step 5: Solve for x
    x = 319,759,173,725.02/645,459.20
  6. Step 6: Final answer
    x = 495,397.96

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1.5x scale

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.