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Finding the Fourth Proportional to 1,436.08, 1,980.36 and 912.40

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Solution

The fourth proportional to 1,436.08, 1,980.36 and 912.40 is: 1,258.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,436.08 : 1,980.36 = 912.40 : x
  2. Step 2: Convert to fraction form
    1,436.08/1,980.36 = 912.40/x
  3. Step 3: Cross multiply
    1,436.08x = 1,980.36 × 912.40
  4. Step 4: Simplify right side
    1,436.08x = 1,806,880.46
  5. Step 5: Solve for x
    x = 1,806,880.46/1,436.08
  6. Step 6: Final answer
    x = 1,258.20

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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.