Home / 1,390,290.34-1,918,547.53-778,385.86

Finding the Fourth Proportional to 1,390,290.34, 1,918,547.53 and 778,385.86

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Solution

The fourth proportional to 1,390,290.34, 1,918,547.53 and 778,385.86 is: 1,074,142.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,290.34 : 1,918,547.53 = 778,385.86 : x
  2. Step 2: Convert to fraction form
    1,390,290.34/1,918,547.53 = 778,385.86/x
  3. Step 3: Cross multiply
    1,390,290.34x = 1,918,547.53 × 778,385.86
  4. Step 4: Simplify right side
    1,390,290.34x = 1,493,370,269,089.93
  5. Step 5: Solve for x
    x = 1,493,370,269,089.93/1,390,290.34
  6. Step 6: Final answer
    x = 1,074,142.74

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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.