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Finding the Fourth Proportional to 1,307.84, 1,960.80 and 430.06

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Solution

The fourth proportional to 1,307.84, 1,960.80 and 430.06 is: 644.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.84 : 1,960.80 = 430.06 : x
  2. Step 2: Convert to fraction form
    1,307.84/1,960.80 = 430.06/x
  3. Step 3: Cross multiply
    1,307.84x = 1,960.80 × 430.06
  4. Step 4: Simplify right side
    1,307.84x = 843,261.65
  5. Step 5: Solve for x
    x = 843,261.65/1,307.84
  6. Step 6: Final answer
    x = 644.77

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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.