Home / 645,250.62-890,207.91-390,508.86

Finding the Fourth Proportional to 645,250.62, 890,207.91 and 390,508.86

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Solution

The fourth proportional to 645,250.62, 890,207.91 and 390,508.86 is: 538,758.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,250.62 : 890,207.91 = 390,508.86 : x
  2. Step 2: Convert to fraction form
    645,250.62/890,207.91 = 390,508.86/x
  3. Step 3: Cross multiply
    645,250.62x = 890,207.91 × 390,508.86
  4. Step 4: Simplify right side
    645,250.62x = 347,634,076,097.08
  5. Step 5: Solve for x
    x = 347,634,076,097.08/645,250.62
  6. Step 6: Final answer
    x = 538,758.22

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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.