Home / 1,420.08-2,129.58-770.46

Finding the Fourth Proportional to 1,420.08, 2,129.58 and 770.46

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Solution

The fourth proportional to 1,420.08, 2,129.58 and 770.46 is: 1,155.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.08 : 2,129.58 = 770.46 : x
  2. Step 2: Convert to fraction form
    1,420.08/2,129.58 = 770.46/x
  3. Step 3: Cross multiply
    1,420.08x = 2,129.58 × 770.46
  4. Step 4: Simplify right side
    1,420.08x = 1,640,756.21
  5. Step 5: Solve for x
    x = 1,640,756.21/1,420.08
  6. Step 6: Final answer
    x = 1,155.40

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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.