Home / 1,390,289.34-1,918,546.16-778,384.86

Finding the Fourth Proportional to 1,390,289.34, 1,918,546.16 and 778,384.86

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Solution

The fourth proportional to 1,390,289.34, 1,918,546.16 and 778,384.86 is: 1,074,141.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,289.34 : 1,918,546.16 = 778,384.86 : x
  2. Step 2: Convert to fraction form
    1,390,289.34/1,918,546.16 = 778,384.86/x
  3. Step 3: Cross multiply
    1,390,289.34x = 1,918,546.16 × 778,384.86
  4. Step 4: Simplify right side
    1,390,289.34x = 1,493,367,280,263.21
  5. Step 5: Solve for x
    x = 1,493,367,280,263.21/1,390,289.34
  6. Step 6: Final answer
    x = 1,074,141.36

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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.