Home / 1,420.02-2,128.59-640.44

Finding the Fourth Proportional to 1,420.02, 2,128.59 and 640.44

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Solution

The fourth proportional to 1,420.02, 2,128.59 and 640.44 is: 960.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.02 : 2,128.59 = 640.44 : x
  2. Step 2: Convert to fraction form
    1,420.02/2,128.59 = 640.44/x
  3. Step 3: Cross multiply
    1,420.02x = 2,128.59 × 640.44
  4. Step 4: Simplify right side
    1,420.02x = 1,363,234.18
  5. Step 5: Solve for x
    x = 1,363,234.18/1,420.02
  6. Step 6: Final answer
    x = 960.01

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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.