Home / 1,688.29-2,328.99-1,129.51

Finding the Fourth Proportional to 1,688.29, 2,328.99 and 1,129.51

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Solution

The fourth proportional to 1,688.29, 2,328.99 and 1,129.51 is: 1,558.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.29 : 2,328.99 = 1,129.51 : x
  2. Step 2: Convert to fraction form
    1,688.29/2,328.99 = 1,129.51/x
  3. Step 3: Cross multiply
    1,688.29x = 2,328.99 × 1,129.51
  4. Step 4: Simplify right side
    1,688.29x = 2,630,617.49
  5. Step 5: Solve for x
    x = 2,630,617.49/1,688.29
  6. Step 6: Final answer
    x = 1,558.15

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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.