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Finding the Fourth Proportional to 1,284,985.60, 1,927,478.40 and 687,788.80

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Solution

The fourth proportional to 1,284,985.60, 1,927,478.40 and 687,788.80 is: 1,031,683.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284,985.60 : 1,927,478.40 = 687,788.80 : x
  2. Step 2: Convert to fraction form
    1,284,985.60/1,927,478.40 = 687,788.80/x
  3. Step 3: Cross multiply
    1,284,985.60x = 1,927,478.40 × 687,788.80
  4. Step 4: Simplify right side
    1,284,985.60x = 1,325,698,055,761.92
  5. Step 5: Solve for x
    x = 1,325,698,055,761.92/1,284,985.60
  6. Step 6: Final answer
    x = 1,031,683.20

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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.