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Finding the Fourth Proportional to 1,313.61, 1,970.61 and 620.95

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Solution

The fourth proportional to 1,313.61, 1,970.61 and 620.95 is: 931.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.61 : 1,970.61 = 620.95 : x
  2. Step 2: Convert to fraction form
    1,313.61/1,970.61 = 620.95/x
  3. Step 3: Cross multiply
    1,313.61x = 1,970.61 × 620.95
  4. Step 4: Simplify right side
    1,313.61x = 1,223,650.28
  5. Step 5: Solve for x
    x = 1,223,650.28/1,313.61
  6. Step 6: Final answer
    x = 931.52

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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.