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Finding the Fourth Proportional to 1,681.69, 2,320.77 and 983.11

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Solution

The fourth proportional to 1,681.69, 2,320.77 and 983.11 is: 1,356.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.69 : 2,320.77 = 983.11 : x
  2. Step 2: Convert to fraction form
    1,681.69/2,320.77 = 983.11/x
  3. Step 3: Cross multiply
    1,681.69x = 2,320.77 × 983.11
  4. Step 4: Simplify right side
    1,681.69x = 2,281,570.08
  5. Step 5: Solve for x
    x = 2,281,570.08/1,681.69
  6. Step 6: Final answer
    x = 1,356.71

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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.