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Finding the Fourth Proportional to 912.90, 1,258.90 and 609.48

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Solution

The fourth proportional to 912.90, 1,258.90 and 609.48 is: 840.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.90 : 1,258.90 = 609.48 : x
  2. Step 2: Convert to fraction form
    912.90/1,258.90 = 609.48/x
  3. Step 3: Cross multiply
    912.90x = 1,258.90 × 609.48
  4. Step 4: Simplify right side
    912.90x = 767,274.37
  5. Step 5: Solve for x
    x = 767,274.37/912.90
  6. Step 6: Final answer
    x = 840.48

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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.