Home / 687,857.40-1,031,931.90-208,045.80

Finding the Fourth Proportional to 687,857.40, 1,031,931.90 and 208,045.80

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Solution

The fourth proportional to 687,857.40, 1,031,931.90 and 208,045.80 is: 312,112.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,857.40 : 1,031,931.90 = 208,045.80 : x
  2. Step 2: Convert to fraction form
    687,857.40/1,031,931.90 = 208,045.80/x
  3. Step 3: Cross multiply
    687,857.40x = 1,031,931.90 × 208,045.80
  4. Step 4: Simplify right side
    687,857.40x = 214,689,097,681.02
  5. Step 5: Solve for x
    x = 214,689,097,681.02/687,857.40
  6. Step 6: Final answer
    x = 312,112.80

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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.