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Finding the Fourth Proportional to 1,290.04, 1,921.47 and 1,263.04

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Solution

The fourth proportional to 1,290.04, 1,921.47 and 1,263.04 is: 1,881.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.04 : 1,921.47 = 1,263.04 : x
  2. Step 2: Convert to fraction form
    1,290.04/1,921.47 = 1,263.04/x
  3. Step 3: Cross multiply
    1,290.04x = 1,921.47 × 1,263.04
  4. Step 4: Simplify right side
    1,290.04x = 2,426,877.55
  5. Step 5: Solve for x
    x = 2,426,877.55/1,290.04
  6. Step 6: Final answer
    x = 1,881.25

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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.