Home / 1,128.02-1,556.70-623.90

Finding the Fourth Proportional to 1,128.02, 1,556.70 and 623.90

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Solution

The fourth proportional to 1,128.02, 1,556.70 and 623.90 is: 861.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.02 : 1,556.70 = 623.90 : x
  2. Step 2: Convert to fraction form
    1,128.02/1,556.70 = 623.90/x
  3. Step 3: Cross multiply
    1,128.02x = 1,556.70 × 623.90
  4. Step 4: Simplify right side
    1,128.02x = 971,225.13
  5. Step 5: Solve for x
    x = 971,225.13/1,128.02
  6. Step 6: Final answer
    x = 861.00

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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.