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Finding the Fourth Proportional to 785.84, 1,170.20 and 777.21

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Solution

The fourth proportional to 785.84, 1,170.20 and 777.21 is: 1,157.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.84 : 1,170.20 = 777.21 : x
  2. Step 2: Convert to fraction form
    785.84/1,170.20 = 777.21/x
  3. Step 3: Cross multiply
    785.84x = 1,170.20 × 777.21
  4. Step 4: Simplify right side
    785.84x = 909,484.32
  5. Step 5: Solve for x
    x = 909,484.32/785.84
  6. Step 6: Final answer
    x = 1,157.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.