Home / 1,330.61-1,985.95-1,308.72

Finding the Fourth Proportional to 1,330.61, 1,985.95 and 1,308.72

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Solution

The fourth proportional to 1,330.61, 1,985.95 and 1,308.72 is: 1,953.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.61 : 1,985.95 = 1,308.72 : x
  2. Step 2: Convert to fraction form
    1,330.61/1,985.95 = 1,308.72/x
  3. Step 3: Cross multiply
    1,330.61x = 1,985.95 × 1,308.72
  4. Step 4: Simplify right side
    1,330.61x = 2,599,061.57
  5. Step 5: Solve for x
    x = 2,599,061.57/1,330.61
  6. Step 6: Final answer
    x = 1,953.28

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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.