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Finding the Fourth Proportional to 705.15, 1,056.59 and 430.70

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Solution

The fourth proportional to 705.15, 1,056.59 and 430.70 is: 645.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.15 : 1,056.59 = 430.70 : x
  2. Step 2: Convert to fraction form
    705.15/1,056.59 = 430.70/x
  3. Step 3: Cross multiply
    705.15x = 1,056.59 × 430.70
  4. Step 4: Simplify right side
    705.15x = 455,065.88
  5. Step 5: Solve for x
    x = 455,065.88/705.15
  6. Step 6: Final answer
    x = 645.35

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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.