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Finding the Fourth Proportional to 785.64, 1,084.20 and 436.35

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Solution

The fourth proportional to 785.64, 1,084.20 and 436.35 is: 602.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.64 : 1,084.20 = 436.35 : x
  2. Step 2: Convert to fraction form
    785.64/1,084.20 = 436.35/x
  3. Step 3: Cross multiply
    785.64x = 1,084.20 × 436.35
  4. Step 4: Simplify right side
    785.64x = 473,090.67
  5. Step 5: Solve for x
    x = 473,090.67/785.64
  6. Step 6: Final answer
    x = 602.17

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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.