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Finding the Fourth Proportional to 926.74, 1,388.75 and 438.77

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Solution

The fourth proportional to 926.74, 1,388.75 and 438.77 is: 657.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.74 : 1,388.75 = 438.77 : x
  2. Step 2: Convert to fraction form
    926.74/1,388.75 = 438.77/x
  3. Step 3: Cross multiply
    926.74x = 1,388.75 × 438.77
  4. Step 4: Simplify right side
    926.74x = 609,335.30
  5. Step 5: Solve for x
    x = 609,335.30/926.74
  6. Step 6: Final answer
    x = 657.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.