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Finding the Fourth Proportional to 210,702.51, 315,987.87 and 70,428.33

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Solution

The fourth proportional to 210,702.51, 315,987.87 and 70,428.33 is: 105,620.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,702.51 : 315,987.87 = 70,428.33 : x
  2. Step 2: Convert to fraction form
    210,702.51/315,987.87 = 70,428.33/x
  3. Step 3: Cross multiply
    210,702.51x = 315,987.87 × 70,428.33
  4. Step 4: Simplify right side
    210,702.51x = 22,254,497,984.36
  5. Step 5: Solve for x
    x = 22,254,497,984.36/210,702.51
  6. Step 6: Final answer
    x = 105,620.47

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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.