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Finding the Fourth Proportional to 684.40, 1,021.88 and 586.74

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Solution

The fourth proportional to 684.40, 1,021.88 and 586.74 is: 876.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.40 : 1,021.88 = 586.74 : x
  2. Step 2: Convert to fraction form
    684.40/1,021.88 = 586.74/x
  3. Step 3: Cross multiply
    684.40x = 1,021.88 × 586.74
  4. Step 4: Simplify right side
    684.40x = 599,580.69
  5. Step 5: Solve for x
    x = 599,580.69/684.40
  6. Step 6: Final answer
    x = 876.07

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.