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Finding the Fourth Proportional to 1,390,621.86, 1,918,899.54 and 778,689.54

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Solution

The fourth proportional to 1,390,621.86, 1,918,899.54 and 778,689.54 is: 1,074,502.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,621.86 : 1,918,899.54 = 778,689.54 : x
  2. Step 2: Convert to fraction form
    1,390,621.86/1,918,899.54 = 778,689.54/x
  3. Step 3: Cross multiply
    1,390,621.86x = 1,918,899.54 × 778,689.54
  4. Step 4: Simplify right side
    1,390,621.86x = 1,494,227,000,108.81
  5. Step 5: Solve for x
    x = 1,494,227,000,108.81/1,390,621.86
  6. Step 6: Final answer
    x = 1,074,502.74

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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.