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Finding the Fourth Proportional to 645,461.85, 890,768.91 and 358,975.79

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Solution

The fourth proportional to 645,461.85, 890,768.91 and 358,975.79 is: 495,404.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,461.85 : 890,768.91 = 358,975.79 : x
  2. Step 2: Convert to fraction form
    645,461.85/890,768.91 = 358,975.79/x
  3. Step 3: Cross multiply
    645,461.85x = 890,768.91 × 358,975.79
  4. Step 4: Simplify right side
    645,461.85x = 319,764,468,720.84
  5. Step 5: Solve for x
    x = 319,764,468,720.84/645,461.85
  6. Step 6: Final answer
    x = 495,404.13

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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.