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Finding the Fourth Proportional to 210,521.40, 315,803.36 and 68,360.72

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Solution

The fourth proportional to 210,521.40, 315,803.36 and 68,360.72 is: 102,547.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,521.40 : 315,803.36 = 68,360.72 : x
  2. Step 2: Convert to fraction form
    210,521.40/315,803.36 = 68,360.72/x
  3. Step 3: Cross multiply
    210,521.40x = 315,803.36 × 68,360.72
  4. Step 4: Simplify right side
    210,521.40x = 21,588,545,068.02
  5. Step 5: Solve for x
    x = 21,588,545,068.02/210,521.40
  6. Step 6: Final answer
    x = 102,547.98

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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.