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Finding the Fourth Proportional to 645.49, 890.31 and 624.07

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Solution

The fourth proportional to 645.49, 890.31 and 624.07 is: 860.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.49 : 890.31 = 624.07 : x
  2. Step 2: Convert to fraction form
    645.49/890.31 = 624.07/x
  3. Step 3: Cross multiply
    645.49x = 890.31 × 624.07
  4. Step 4: Simplify right side
    645.49x = 555,615.76
  5. Step 5: Solve for x
    x = 555,615.76/645.49
  6. Step 6: Final answer
    x = 860.77

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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.