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Finding the Fourth Proportional to 780.19, 1,075.17 and 558.75

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Solution

The fourth proportional to 780.19, 1,075.17 and 558.75 is: 770.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.19 : 1,075.17 = 558.75 : x
  2. Step 2: Convert to fraction form
    780.19/1,075.17 = 558.75/x
  3. Step 3: Cross multiply
    780.19x = 1,075.17 × 558.75
  4. Step 4: Simplify right side
    780.19x = 600,751.24
  5. Step 5: Solve for x
    x = 600,751.24/780.19
  6. Step 6: Final answer
    x = 770.01

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Double scale
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1.5x scale

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.