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Finding the Fourth Proportional to 645,262.72, 890,184 and 403,123.84

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Solution

The fourth proportional to 645,262.72, 890,184 and 403,123.84 is: 556,136.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,262.72 : 890,184 = 403,123.84 : x
  2. Step 2: Convert to fraction form
    645,262.72/890,184 = 403,123.84/x
  3. Step 3: Cross multiply
    645,262.72x = 890,184 × 403,123.84
  4. Step 4: Simplify right side
    645,262.72x = 358,854,392,386.56
  5. Step 5: Solve for x
    x = 358,854,392,386.56/645,262.72
  6. Step 6: Final answer
    x = 556,136.87

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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.