Home / 20,918,681.80-31,389,168.30-8,139,603.40

Finding the Fourth Proportional to 20,918,681.80, 31,389,168.30 and 8,139,603.40

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Solution

The fourth proportional to 20,918,681.80, 31,389,168.30 and 8,139,603.40 is: 12,213,741.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918,681.80 : 31,389,168.30 = 8,139,603.40 : x
  2. Step 2: Convert to fraction form
    20,918,681.80/31,389,168.30 = 8,139,603.40/x
  3. Step 3: Cross multiply
    20,918,681.80x = 31,389,168.30 × 8,139,603.40
  4. Step 4: Simplify right side
    20,918,681.80x = 255,495,381,017,852.25
  5. Step 5: Solve for x
    x = 255,495,381,017,852.25/20,918,681.80
  6. Step 6: Final answer
    x = 12,213,741.93

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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.