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Finding the Fourth Proportional to 645,473.66, 890,785.20 and 358,987.62

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Solution

The fourth proportional to 645,473.66, 890,785.20 and 358,987.62 is: 495,420.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,473.66 : 890,785.20 = 358,987.62 : x
  2. Step 2: Convert to fraction form
    645,473.66/890,785.20 = 358,987.62/x
  3. Step 3: Cross multiply
    645,473.66x = 890,785.20 × 358,987.62
  4. Step 4: Simplify right side
    645,473.66x = 319,780,858,879.22
  5. Step 5: Solve for x
    x = 319,780,858,879.22/645,473.66
  6. Step 6: Final answer
    x = 495,420.46

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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.