Home / 1,287.89-1,931.93-507.51

Finding the Fourth Proportional to 1,287.89, 1,931.93 and 507.51

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Solution

The fourth proportional to 1,287.89, 1,931.93 and 507.51 is: 761.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.89 : 1,931.93 = 507.51 : x
  2. Step 2: Convert to fraction form
    1,287.89/1,931.93 = 507.51/x
  3. Step 3: Cross multiply
    1,287.89x = 1,931.93 × 507.51
  4. Step 4: Simplify right side
    1,287.89x = 980,471.26
  5. Step 5: Solve for x
    x = 980,471.26/1,287.89
  6. Step 6: Final answer
    x = 761.30

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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.