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Finding the Fourth Proportional to 623.70, 874.80 and 623.70

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Solution

The fourth proportional to 623.70, 874.80 and 623.70 is: 874.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.70 : 874.80 = 623.70 : x
  2. Step 2: Convert to fraction form
    623.70/874.80 = 623.70/x
  3. Step 3: Cross multiply
    623.70x = 874.80 × 623.70
  4. Step 4: Simplify right side
    623.70x = 545,612.76
  5. Step 5: Solve for x
    x = 545,612.76/623.70
  6. Step 6: Final answer
    x = 874.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.