Home / 1,390,288.78-1,918,152.66-778,351.60

Finding the Fourth Proportional to 1,390,288.78, 1,918,152.66 and 778,351.60

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Solution

The fourth proportional to 1,390,288.78, 1,918,152.66 and 778,351.60 is: 1,073,875.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,288.78 : 1,918,152.66 = 778,351.60 : x
  2. Step 2: Convert to fraction form
    1,390,288.78/1,918,152.66 = 778,351.60/x
  3. Step 3: Cross multiply
    1,390,288.78x = 1,918,152.66 × 778,351.60
  4. Step 4: Simplify right side
    1,390,288.78x = 1,492,997,191,955.26
  5. Step 5: Solve for x
    x = 1,492,997,191,955.26/1,390,288.78
  6. Step 6: Final answer
    x = 1,073,875.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.